Expulsion, also known as dismissal, withdrawal, or permanent exclusion (British English), is the permanent removal or banning of a student from a school, school district, college, university, or TAFE due to persistent violation of that institution's rules, or in extreme cases, for a single offense of marked severity. Colloquialisms for expulsion include being kicked out of school or sent down. Laws and procedures regarding expulsion vary between countries and states.

The practice of pressuring parents to voluntarily withdraw their child from an educational institution, termed off-rolling in the UK, is comparable to expulsion. Rates of expulsion may be especially high for students of color, even when their behavioral infractions are the same as those of white children. Certain disabilities, such as autism and ADHD, also increases the risk of expulsion, despite the fact that this constitutes unlawful discrimination in many jurisdictions.